The Draw Texturing Process

Abstract

The results of extensive research about draw texturing of polyester fiber are presented. Draw texturing was done on a rebuilt Barmag FK 4 production machine. The draw texturing process for which we used false twist spindles was carried out sequentially and simultaneously. The physics of both processes and the combined influence of drawing and texturing on the structural and textile properties of the yarns are discussed. Process parameters like spinning speed, draw ratio, hot-pin temperature, heater temperature, yarn twist, over-feed, and yam tension were included in the tests. By variation of these parameters yam properties were optimized. The physical and textile properties of the yams were tested, with special attention to the uniformity of the yam crimp. A new crimp tester was developed to measure the crimp contraction continuously and give information about the crimp uniformity within short length. The results achieved with simultaneous draw texturing are discussed in detail, especially the influence of the spinning speed (primary spinning) on yarn properties. The properties of sequentially and simultaneously textured yarns are compared with each other and with a conventionally textured yarn.